Intrauterine Device

The modern intrauterine device (IUD) is a form of birth control in which a small ‘T’-shaped device, containing either copper or progesterone, is inserted into the uterus. IUDs are a form of long-acting reversible contraception, which is the most effective type of reversible birth control. As of 2002, IUDs were the most widely used form of reversible contraception, with nearly 160 million users worldwide. (from Wikipedia)

Pelvic radiograph shows normal positioning of an IUD. The IUD is upright in the midline pelvis inferior to the pelvic brim, in the expected location of the uterus.

image from Radiographics.rsna.org

Additional image (here).  And link (here)

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